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