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