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