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