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