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