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