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