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