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