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