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