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