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