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