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