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