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)(17,18,21,23)(19,22,25,30)(20,24,28,31)(26,29,27,32)(33,34,38,42)(35,43,45,39)(36,40,46,47)(37,41,44,48)(3,9)(7,13)(10,15)(14,16)(17,19)(18,22)(20,27)(21,25)(23,30)(24,32)(26,28)(29,31)(33,35,38,45)(34,39,42,43)(36,44,46,37)(40,41,47,48)(2,6)(7,13)(8,11)(14,16)(18,23)(19,25)(20,28)(29,32)(36,46)(37,44)(40,47)(41,48) involution — undirected(1,2)(3,7)(4,8)(5,6)(9,13)(10,14)(11,12)(15,16)(17,19)(18,22)(20,27)(21,25)(23,30)(24,32)(26,28)(29,31)(33,34)(35,39)(36,47)(37,41)(38,42)(40,46)(43,45)(44,48) involution — undirected(1,3)(2,7)(4,10)(5,9)(6,13)(8,14)(11,16)(12,15)(17,20)(18,24)(19,26)(21,28)(22,29)(23,31)(25,27)(30,32)(33,36)(34,40)(35,44)(37,45)(38,46)(39,41)(42,47)(43,48) involution — undirected(1,4)(2,8)(3,10)(5,12)(6,11)(7,14)(9,15)(13,16)(17,18)(19,22)(20,24)(21,23)(25,30)(26,29)(27,32)(28,31)(33,37,38,44)(34,41,42,48)(35,36,45,46)(39,47,43,40)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.