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