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