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