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