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)(1,3,4,8)(2,5,6,7)(9,11)(10,13)(12,15)(14,16)(17,18,23,19)(20,28,30,32)(21,25,22,27)(24,31,26,29)(10,14)(11,15)(17,19,23,18)(20,26,30,24)(21,25,22,27)(28,29,32,31)(10,14)(13,16)(17,20)(18,24)(19,26)(21,29)(22,31)(23,30)(25,32)(27,28) involution — undirected(2,6)(5,7)(17,21,23,22)(18,25,19,27)(20,29,30,31)(24,32,26,28)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.