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