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