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