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