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