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