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