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