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