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