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