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