One vertex per element, one color per generator, with an edge from x to x·s.
(2,4)(5,6)(7,11)(8,17)(9,13)(10,14)(12,16)(15,20)(18,19)(23,29)(25,33)(27,35)(28,32)(30,36)(31,34) involution — undirected(1,2,3,4)(5,7,10,9)(6,11,14,13)(8,16,18,15)(12,19,20,17)(21,22,26,24)(23,30,31,27)(25,28,33,32)(29,36,34,35)(5,8)(6,12)(7,15)(9,16)(10,18)(11,17)(13,19)(14,20)(21,23,26,31)(22,27,24,30)(25,34,33,29)(28,36,32,35)(5,8)(6,12)(7,16)(9,15)(10,18)(11,19)(13,17)(14,20)(21,24,26,22)(23,30,31,27)(25,28,33,32)(29,35,34,36)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.