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