One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,11)(5,6)(8,12)(9,13)(10,16)(14,15)(17,18)(19,23)(20,26)(21,29)(22,24)(25,28)(27,32)(30,31)(33,34)(35,42)(36,41)(37,39)(38,40)(43,48)(44,46)(45,47) involution — undirected(3,9)(7,13)(10,15)(14,16)(17,19)(18,23)(20,27)(21,30)(22,28)(24,25)(26,32)(29,31)(33,35,38,37)(34,39,40,42)(36,44,45,43)(41,48,47,46)(2,6)(7,13)(8,11)(14,16)(18,24)(19,28)(26,30)(27,29)(34,40)(39,42)(41,47)(46,48) involution — undirected(1,2)(3,7)(4,8)(5,6)(9,13)(10,14)(11,12)(15,16)(17,19)(18,25)(20,29)(21,30)(22,28)(23,24)(26,32)(27,31)(33,34)(35,39)(36,41)(37,42)(38,40)(43,46)(44,48)(45,47) involution — undirected(1,3)(2,7)(4,10)(5,9)(6,13)(8,14)(11,16)(12,15)(17,20)(18,26)(19,29)(21,23)(22,31)(24,30)(25,32)(27,28)(33,36,38,45)(34,41,40,47)(35,43,37,44)(39,46,42,48)(1,4)(2,8)(3,10)(5,12)(6,11)(7,14)(9,15)(13,16)(17,21,22,32)(18,27,24,29)(19,30,28,26)(20,25,31,23)(33,37,38,35)(34,42,40,39)(36,43,45,44)(41,46,47,48)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.