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