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