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