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