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