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