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