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