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