One vertex per element, one color per generator, with an edge from x to x·s.
(2,5)(3,7)(9,10)(11,14)(12,16)(13,15)(17,18,22,25,21,24,29,31)(19,26,28,32,27,20,23,30)(1,2)(3,6)(4,5)(7,8)(9,11,13,12)(10,14,15,16)(17,19)(18,20)(21,27)(22,28)(23,29)(24,26)(25,30)(31,32)(9,12,13,11)(10,14,15,16)(19,27)(20,26)(23,28)(30,32)(2,5)(6,8)(19,27)(20,26)(23,28)(30,32) involution — undirected(1,3,4,7)(2,6,5,8)(17,20,29,32,21,26,22,30)(18,23,31,27,24,28,25,19)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.