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