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