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)(17,18,23,26,22,25,32,27)(19,21,24,30,28,20,29,31)(1,3,5,8)(2,6,4,7)(9,11,12,15)(10,13,14,16)(17,19)(18,20)(21,25)(22,28)(23,24)(26,31)(27,30)(29,32)(1,4,5,2)(3,7,8,6)(10,14)(13,16)(17,20)(18,24)(19,27)(21,22)(23,31)(25,29)(26,28)(30,32)(3,8)(6,7)(17,21)(18,19)(20,22)(23,31)(24,27)(25,28)(26,29)(30,32) 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.