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