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