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