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