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