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