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