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