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