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