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