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