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