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)(21,22,27,25)(23,28,26,31)(24,32,35,36)(29,33,34,30)(1,2,3,4)(5,7,10,9)(6,11,14,13)(8,16,18,15)(12,19,20,17)(21,23,27,26)(22,28,25,31)(24,33,35,30)(29,32,34,36)(5,8)(6,12)(7,15)(9,16)(10,18)(11,17)(13,19)(14,20)(21,24)(22,29)(23,30)(25,34)(26,33)(27,35)(28,36)(31,32) involution — undirected(5,8)(6,12)(7,16)(9,15)(10,18)(11,19)(13,17)(14,20)(21,25,27,22)(23,31,26,28)(24,34,35,29)(30,32,33,36)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.