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