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