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)(11,14)(12,13)(15,16)(17,18)(19,27)(20,25)(21,24)(22,26)(23,28)(29,31)(30,32) involution — undirected(1,3,5,4)(2,6,7,8)(9,10)(11,14)(12,13)(15,16)(17,19,21,28)(18,23,24,27)(20,30,22,29)(25,31,26,32)(1,4,5,3)(2,6,7,8)(10,13)(14,16)(18,24)(19,28)(25,26)(29,30)(10,13)(14,16)(18,24)(19,29)(20,22)(23,31)(27,32)(28,30) involution — undirected(2,7)(6,8)(9,11,12,15)(10,14,13,16)(17,20,21,22)(18,25,24,26)(19,30,28,29)(23,31,27,32)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.