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)(24,32)(25,37)(30,42)(31,41)(33,40)(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)(17,19,21,32,23,33,22,31)(18,24,27,29,28,41,26,40)(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)(19,30,33,35)(21,37,22,38)(24,39,41,42)(26,44,27,34)(29,45,40,48)(31,46,32,47)(1,4,5,13)(2,7,8,16)(3,10,11,12)(6,14,9,15)(20,36)(25,43)(30,35)(34,44)(37,38)(39,42)(45,48)(46,47)(2,8)(6,9)(7,16)(14,15)(17,21,23,22)(18,26,28,27)(19,31,33,32)(20,37,36,38)(24,29,41,40)(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.