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