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