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