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