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