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