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