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