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