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