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