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