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