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