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