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