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