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