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