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