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