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