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