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