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