One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,4)(5,13)(6,7)(8,10)(9,14)(11,15)(12,16)(17,18,22,26)(19,23,27,30)(20,24,29,32)(21,25,31,28)(33,34)(35,42)(36,41)(37,40)(38,39)(43,48)(44,47)(45,46)(2,7)(4,8)(9,13)(12,15)(17,19)(18,23)(20,28)(21,24)(22,27)(25,29)(26,30)(31,32)(35,37)(40,42)(43,44)(47,48) involution — undirected(2,7)(3,10)(5,14)(12,15)(19,27)(20,29)(23,30)(24,32)(33,35,39,37)(34,40,38,42)(36,44,46,43)(41,48,45,47)(1,3,6,10)(2,8,7,4)(5,11,14,16)(9,15,13,12)(17,20)(18,24)(19,28)(21,23)(22,29)(25,27)(26,32)(30,31)(33,36,39,46)(34,41,38,45)(35,43,37,44)(40,47,42,48)(1,4,6,8)(2,3,7,10)(5,12,14,15)(9,11,13,16)(17,21)(18,25)(19,24)(20,30)(22,31)(23,29)(26,28)(27,32)(33,37,39,35)(34,40,38,42)(36,43,46,44)(41,48,45,47)(1,5)(2,9)(3,11)(4,12)(6,14)(7,13)(8,15)(10,16)(17,19)(18,23)(20,28)(21,24)(22,27)(25,29)(26,30)(31,32)(33,38,39,34)(35,40,37,42)(36,45,46,41)(43,47,44,48)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.