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